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OOD Phase 1 > ARPA > Flashcards

ARPA Flashcards

1
Q

Which of the following contributes to assessment of risk of collision?

A
  • Relative motion line (CPA/TCPA)
  • Aspect
  • Amount of error in the calculations
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2
Q

What controls would you adjust if known targets were not being detected by RADAR?

A
  • Gain
  • Suppressions
  • Range Scale
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3
Q

A RADAR contact will remain stationary on a relative motion radar display only when it is…

A

On the same course and speed as your vessel

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4
Q

The CPA of a contact on a relative motion RADAR may be determined:

A

After the contact has been marked at least twice over a period of at least a minute.

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5
Q

A RADAR display in which the orientation of the display is fixed so that North is always at the top of the screen is called a/an

A

Stabilized display

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6
Q

What inputs are required to maintain a North-up, True Motion display

A

Gyro course and Log speed

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7
Q

In addition to ARPA info, an ARPA user should take into account:

A
  • The limitations of that info
  • ROR
  • The circumstances of the situation including external considerations
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8
Q

In restricted visibility what should you avoid when altering course for a vessel forward of your beam that you cannot see visually?

A

Altering course to port except in overtaking situations

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9
Q

When two ARPA equipped ships collide, which of the following is typically true?

A

Both vessels are likely to be found at fault.

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10
Q

When using ARPA, what should you consider in order to evaluate the info displayed?

A

Navigational constraints may require a target vessel to change course

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11
Q

Which of the following info is least dependent of ARPA processing?

A

EBL/VRM data

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12
Q

According to IMO, log and speed indicators providing inputs to ARPA equipment should be capable of providing:

A

The ship’s speed through the water

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13
Q

What is the min. number of targets that an IMO approved ARPA must track simultaneously?

A

20 targets

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14
Q

What is the lowest range scale that IMO requires ARPA facilities to be available on?

A

3 miles

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15
Q

According to IMO standards, the ARPA data display:

A

Should be visible to more than one observer in conditions of light normally experienced on the bridge by day or night.

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16
Q

Regarding the IMO requirement for past positions

A

All ARPAs can display both true and relative past positions

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17
Q

IMO requires ARPA to operate in relative motion with:

A

Either north-up or head-up or course-up display

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18
Q

According to IMO performance standards, what should an ARPA do to improve the standard of collision avoidance at sea?

A

ARPA should reduce the workload of observers by automatically providing information.

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19
Q

The ARPA facilities should be available on at least the following range scales:

A

3 or 4 miles and 12 or 16 miles

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20
Q

Two conditions needed for +/- steady state tracking

A
  1. Ownship maintains course & speed
  2. Target maintains course & speed
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21
Q

Which of the following is NOT a required operational warning on ARPA’s

A

Automatically Acquired Target

22
Q

The NavLines displayed on an ARPA

A

Will drift when ARPA is sea-stabilized.

23
Q

Gradual alterations of course will help the ARPA process data faster and provide more accurate info?
True or False

A

False

24
Q

When observing a target’s past positions in TM what informatino can be quickly “gleaned”?

A

Target has changed course

25
Q

Watchstanders can measure error in the ARPA presented information by using:

A

A plotting sheet or grease pencil plot on a reflection plotter.

26
Q

You observe a target visually dead but is displayed on your RADAR at 5 degrees to STBD of the heading flash. How would you correct this?

A

Check the scanner for antenna misalignment.

27
Q

When an ARPA-tracked target maneuvers:

A

First indication of a maneuver will probably be seen on a persistence or afterglow feature if your ARPA has one

28
Q

Regarding ARPA errors, which of the following is true?

A

Relying on ARPA information can be dangerous

29
Q

The vector displayed after 3 minutes of steady state tracking:

A

Represents the targets probable pas projected into the future

30
Q

When operating a RADAR in fog, it is possible to have a limited effective range?
True or False

A

True

31
Q

Which general statement concerning RADAR is NOT true?

A

The ability of RADAR to detect objects is unaffected by weather conditions

32
Q

When operating a RADAR in fog RADAR ranges are less accurate?
True or False

A

False

33
Q

You will get an alarm if target swap has occured.
True or False

A

False

33
Q

If CPA/TCPA alarm is continually going off what should you do?

A

Adjust the limits to reflect the conditions

34
Q

What input to an ARPA is needed for sea stabilized info?

A

RADAR input, gyro heading, and STW

35
Q

What do ground stabilized true vectors intended to represent?

A

The recent track of a target’s motion over the ground projected into the future

36
Q

When using navlines for nav, which stabilization method should be used?

A

Ground

37
Q

When can Trial Manuever mode display inaccurate information?

A

When the ARPA (vectors) are ground stabilized.

38
Q

When using a course-up stabilized display

A

The heading flasher does not move when you change course

39
Q

Which of the following statements is TRUE regarding AIS?

A

AIS provides the other vessel’s identity, dimensions and navigational status regardless of visibility

40
Q

Which of the following is true of the history display of past positions on an ARPA?

A

In the true presentation, it provides a quick visual check to determine if a vessel has changed course

41
Q

If your speed input is incorrect, what effect would it have on your ARPA data?

A

True vectors would be incorrect

42
Q

Cases in which your ARPA will alarm.

A
  • Target initially detected in guard zone
  • Target tracked who violates CPA/TCPA limits
  • Lost target
  • Tracked target who violates BCT/BCR
  • ARPA failure
  • Input loss
43
Q

Your ARPA has two guard “trip wire” ring alarms. What is the purpose of the inner guard ring?

A

Warn of small targets that are initially detected closer than the outer guard ring

44
Q

When ARPA’s are used in sea stabilized mode with true tracks, data relating to own ship’s motion is fed to the ARPA from the ___.

A

Speed log and gyro

45
Q

When your ship is in a cross current, the NavLines on your ARPA screen will remain staionary, or near stationary, when you operate in

A

Ground stabilized mode

46
Q

Which warning is required by the IMO performance standards?

A

A warning any time a target closes to a designated range or transits a zone, chosen by the observer.

47
Q

Provided a target is not subject to target swap, the ARPA should continue to track an acquired target which is clearly distinguishable on the display for___

A

5/10 consecutive scans

48
Q

Which of the following is NOT a commonly used term for ARPA’s target persistence of afterglow?

A

History dots

49
Q

Conditions that would cause a fixed target to appear to have a true speed of more than zero.

A
  • Centroid shift
  • Current
  • Incorrect speed input on ARPA
  • Target swap

OOD Phase 1 (1 decks)

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